The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 16, 1994
Filed:
Oct. 15, 1992
Bernard J Krauska, Stevens Point, WI (US);
Randy Wisniewski, Plover, WI (US);
Warren J Peterson, Stevens Point, WI (US);
Joerns Healthcare Inc., Stevens Point, WI (US);
Abstract
An adjustable bed includes a base frame, a mattress frame and linkage for mounting the mattress frame for relative movement with respect to the base frame. A mechanical jack is operatively connected to the base frame and the linkage for moving the mattress frame between high and low positions. A mechanical jack includes an enclosure. A bearing supports a ram within the enclosure for extension and retraction. A drive plate and a hold plate define apertures through which the ram extends. A drive bar is shifted by rotation of an actuator shaft to lock the drive plate to the ram and extend the ram from the housing. The drive spring resiliently biases the drive plate to an unlocked or return position. A hold spring biases the hold plate to a locked position to prevent return movement of the ram into the enclosure. A release bar is shifted into engagement with the hold plate upon reverse rotation of the actuator shaft to release the plate and permit lowering of the ram into the enclosure.